04-29-2013 11:37 AM - edited 03-07-2019 01:05 PM
Getting teh following error on my config for a switch.
00:36:26: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/1 (1), with sw-testlab. dgit.net GigabitEthernet4/0/20 (104).
lab1#show run int vlan 808
Current configuration : 175 bytes
!
interface Vlan808
ip address 192.168.30.1 255.255.255.0
ip helper-address 10.1.1.72
ip helper-address 10.1.1.73
no ip redirects
no ip proxy-arp
no ip route-cache
end
Cisco Vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/3, Fa0/4, Fa0/5, Fa0/6
Fa0/7, Fa0/8, Fa0/9, Fa0/10
Fa0/11, Fa0/12, Fa0/13, Fa0/14
Fa0/15, Fa0/16, Fa0/17, Fa0/18
Fa0/19, Fa0/20, Fa0/21, Fa0/22
Fa0/23, Fa0/24
11 sh-inside active
15 outside active
20 dmz active
21 sh-dmz active
101 servers active
103 user_data active
104 wifi active
808 VLAN0808 active Fa0/1, Fa0/2
Cisco version
cisco WS-C2950-24 (RC32300) processor (revision R0) with 19918K bytes of memory.
Processor board ID FOC0911Y02M
Last reset from system-reset
Running Standard Image
24 FastEthernet/IEEE 802.3 interface(s)
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:13:7F:E4:2C:40
Motherboard assembly number: 73-5781-13
Power supply part number: 34-0965-01
Motherboard serial number: FOC09081JAB
Power supply serial number: DAB09083EHY
Model revision number: R0
Motherboard revision number: A0
Model number: WS-C2950-24
System serial number: FOC0911Y02M
Configuration register is 0xF
04-29-2013 12:47 PM
Can you give a 'show run int fa0/1' on lab1 and 'show run int gi4/0/20' on sw-testlab.dgit.net? It looks like the gig port is configured as a trunk port and the fast ethernet is configured as an access port.
04-29-2013 12:52 PM
#show run int gi 4/0/20
Building configuration...
Current configuration : 118 bytes
!
interface GigabitEthernet4/0/20
switchport access vlan 104
switchport voice vlan 204
spanning-tree portfast
end
lab1#show run int fa0/1
Building configuration...
Current configuration : 85 bytes
!
interface FastEthernet0/1
switchport access vlan 808
switchport mode access
end
04-29-2013 12:55 PM
There is your Native VLAN mismatch. Port fa0/1 is sending VLAN 808 and gi 4/0/20 is sending 104. What are you trying to send between the two switches?
04-29-2013 12:57 PM
What i would like to do is add this switch in the conference room, and connect it to our existing network. Just basically providing more ports for a room with no ports.
04-29-2013 01:11 PM
You could just wipe and erase the 2950 and plug it in as it is. That would be 'wr erase' and 'delete vlan.dat', then reload. Make sure you take spanning-tree portfast off of port gi4/0/20. You should probably set up a trunk between the two, though. It would be something like:
! sw-testlab. dgit.net
int gi4/0/20
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk allowed vlan 104,204, [mgmt vlan]
!
! lab1
int fa0/1
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk allowed vlan 104,204, [mgmt vlan]
!
int range fa0/2 - 24
switchport mode access
switchport access vlan 104
switchport voice vlan 204
spanning-tree portfast
!
vlan 104
name data
vlan 204
name voice
!
What is your management VLAN? 808?
04-29-2013 01:44 PM
Management vlan is 100
04-29-2013 02:55 PM
So include that VLAN on your trunks:
! lab1
int fa0/1
switchport trunk allowed vlan add 100
!
! sw-testlab. dgit.net
int gi4/0/20
switchport trunk allowed vlan add 100
!
And give the 'lab1' switch an IP address on your management subnet:
! lab1
vlan 100
name mgmt
!
int vlan 100
ip address [ip address] [subnet mask]
no shut
!
ip default-gateway [gateway of mgmt subnet]
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